Built-in pump. Inflates in 30 seconds. Clean and hygienic to use. There is also a normal air vent (where air is released), so it can be folded up quickly. Made of 100% cotton that is gentle on the skin, so it is soft and there is no hard material that will fit your neck, so you can use it comfortably. Can be used in a variety of situations, such as home, office, school, travel, disasters, disaster prevention, driving, half-bath or long travel.